EP 0218456 B1 19920819 - AUTOMATIC BIAS CONTROL OF AN IMAGE DISPLAY DEVICE IN A VIDEO MONITOR
Title (en)
AUTOMATIC BIAS CONTROL OF AN IMAGE DISPLAY DEVICE IN A VIDEO MONITOR
Publication
Application
Priority
GB 8524197 A 19851001
Abstract (en)
[origin: US4694350A] A data display video monitor includes an automatic kinescope bias (AKB) control system for the type wherein kinescope cathode output pulses representative of the black current level conducted by the kinescope are produced in response to energizing the kinescope grid during sensing intervals. As a result of this operation, plural horizontal lines along the top edge of the visible display screen area are illuminated. To reduce the visible effect of the illuminated lines, the AKB system is activated for short sensing intervals (e.g., two seconds or less) between considerably longer holding intervals (e.g., five minutes).
IPC 1-7
IPC 8 full level
H04N 9/73 (2006.01); G09G 1/00 (2006.01); G09G 1/28 (2006.01); H04N 9/72 (2006.01)
CPC (source: EP KR US)
Designated contracting state (EPC)
BE DE FR GB IT
DOCDB simple family (publication)
EP 0218456 A2 19870415; EP 0218456 A3 19880518; EP 0218456 B1 19920819; DE 3686467 D1 19920924; DE 3686467 T2 19930415; GB 8524197 D0 19851106; HK 88597 A 19970627; JP 2916094 B2 19990705; JP H07287545 A 19951031; JP H087535 B2 19960129; JP S6298388 A 19870507; KR 870004619 A 19870511; KR 940003051 B1 19940411; US 4694350 A 19870915
DOCDB simple family (application)
EP 86307509 A 19861001; DE 3686467 T 19861001; GB 8524197 A 19851001; HK 88597 A 19970626; JP 23423086 A 19860930; JP 7886395 A 19950404; KR 860008213 A 19860930; US 89650386 A 19860815